Comment by kayodelycaon

Oh wonderful. That’s what’s happening to me. I’m an author and Apple‘s dictionary appears to be missing about half the more uncommon words in the English language. It’ll never recognize “prescient” in dictation for example. Some words it marks in red because it thinks it’s a spelling error. I know it’s not because I’ve used it, read it, and it’s in online dictionaries.

At least I’m macOS I can use Talon instead of the system dictation.